Can not be imported as a dangling index as an index with the same name and UUID exist in the – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-7.8

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Briefly, this error occurs when Elasticsearch tries to import an index that has the same name and UUID as an existing index. This is known as a dangling index. To resolve this issue, you can either delete the existing index if it’s no longer needed or rename the index you’re trying to import. Alternatively, you can change the UUID of the index you’re trying to import. Always ensure to backup your data before making such changes to prevent data loss.

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This guide will help you check for common problems that cause the log ” [{}] can not be imported as a dangling index; as an index with the same name and UUID exist in the ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: index, dangling.

Log Context

Log “[{}] can not be imported as a dangling index; as an index with the same name and UUID exist in the ” classname is DanglingIndicesState.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

            for (IndexMetadata indexMetadata : indexMetadataList) {
                if (metadata.hasIndex(indexMetadata.getIndex().getName())) {
                    logger.warn("[{}] can not be imported as a dangling index; as index with same name already exists in cluster metadata";
                        indexMetadata.getIndex());
                } else if (graveyard.containsIndex(indexMetadata.getIndex())) {
                    logger.warn("[{}] can not be imported as a dangling index; as an index with the same name and UUID exist in the " +
                                "index tombstones.  This situation is likely caused by copying over the data directory for an index " +
                                "that was previously deleted."; indexMetadata.getIndex());
                } else {
                    logger.info("[{}] dangling index exists on local file system; but not in cluster metadata; " +
                                "auto import to cluster state"; indexMetadata.getIndex());

 

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